103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
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// Definitions for the Interchange File Format (IFF)
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// Alexander Gessler, 2006
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// Adapted to Assimp August 2008
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#ifndef AI_IFF_H_INCLUDED
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#define AI_IFF_H_INCLUDED
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#include <assimp/ByteSwapper.h>
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namespace Assimp {
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namespace IFF {
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/////////////////////////////////////////////////////////////////////////////////
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//! Describes an IFF chunk header
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/////////////////////////////////////////////////////////////////////////////////
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struct ChunkHeader
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{
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//! Type of the chunk header - FourCC
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uint32_t type;
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//! Length of the chunk data, in bytes
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uint32_t length;
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};
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/////////////////////////////////////////////////////////////////////////////////
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//! Describes an IFF sub chunk header
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/////////////////////////////////////////////////////////////////////////////////
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struct SubChunkHeader
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{
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//! Type of the chunk header - FourCC
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uint32_t type;
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//! Length of the chunk data, in bytes
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uint16_t length;
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};
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#define AI_IFF_FOURCC(a,b,c,d) ((uint32_t) (((uint8_t)a << 24u) | \
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((uint8_t)b << 16u) | ((uint8_t)c << 8u) | ((uint8_t)d)))
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#define AI_IFF_FOURCC_FORM AI_IFF_FOURCC('F','O','R','M')
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/////////////////////////////////////////////////////////////////////////////////
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//! Load a chunk header
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//! @param outFile Pointer to the file data - points to the chunk data afterwards
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//! @return Copy of the chunk header
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/////////////////////////////////////////////////////////////////////////////////
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inline ChunkHeader LoadChunk(uint8_t*& outFile)
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{
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ChunkHeader head;
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::memcpy(&head.type, outFile, 4);
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outFile += 4;
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::memcpy(&head.length, outFile, 4);
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outFile += 4;
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AI_LSWAP4(head.length);
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AI_LSWAP4(head.type);
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return head;
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}
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/////////////////////////////////////////////////////////////////////////////////
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//! Load a sub chunk header
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//! @param outFile Pointer to the file data - points to the chunk data afterwards
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//! @return Copy of the sub chunk header
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/////////////////////////////////////////////////////////////////////////////////
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inline SubChunkHeader LoadSubChunk(uint8_t*& outFile)
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{
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SubChunkHeader head;
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::memcpy(&head.type, outFile, 4);
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outFile += 4;
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::memcpy(&head.length, outFile, 2);
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outFile += 2;
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AI_LSWAP2(head.length);
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AI_LSWAP4(head.type);
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return head;
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}
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/////////////////////////////////////////////////////////////////////////////////
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//! Read the file header and return the type of the file and its size
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//! @param outFile Pointer to the file data. The buffer must at
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//! least be 12 bytes large.
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//! @param fileType Receives the type of the file
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//! @return 0 if everything was OK, otherwise an error message
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/////////////////////////////////////////////////////////////////////////////////
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inline const char* ReadHeader(uint8_t* outFile, uint32_t& fileType)
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{
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ChunkHeader head = LoadChunk(outFile);
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if(AI_IFF_FOURCC_FORM != head.type)
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{
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return "The file is not an IFF file: FORM chunk is missing";
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}
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::memcpy(&fileType, outFile, 4);
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AI_LSWAP4(fileType);
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return 0;
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}
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}}
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#endif // !! AI_IFF_H_INCLUDED
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